Vanilla Music - Vanilla Music is a clean, simple and opensource music player for Android.
Vinyl Music Player - A fork of Phonograph Music Player that "makes all Pro features free, as they used to be".
Shuttle Music Player - Built by a music lover for music lovers, Shuttle is the music player of choice for your Android...
Black Hole - An open source music streaming app
AIMP - AIMP : Free Audio Player : Официальный сайт программы
Musicolet - Musicolet is a small yet feature-rich offline Music Player for Android.